Steam-generator



(No Model.)

L- W. POND.

STEAM GENERATOR.

No. 340,060. 'Patented Apr. 13, 1886.

UNITED STATES PATENT OFFICE@l LUCIL'S W. POND, OF VORCESTER, MASSACHUSETTS.

STEAM-GENERATO R.

SPECIFICATION forming part of Letters Patent No'. 340,060, dated April 13, 1886.

(No model.)

To all whom it may concern:

Be it known that I, LUCIUS WV. POND, a citizen of the United States, residing at W'orcester, in the county of Vorcester and State of Massachusetts, have invented a new and useful Improvement in Steam-Generators, of which the following is a specification, accom panied by drawings, in which- Figure l shows a vertical sectional view of a steam-generator embodying my invention, and Fig. 2 is a transverse sectional View of the same with the boiler removed.

Similar letters refer to similar parts in the several views.

My invention relates to that class of steamgenerators which embody a boiler having a iiat side or crown-sheet, on which the water rests, and which forms the heating-surface; and my invention consists in the construction of the boiler and fire-pot, as hereinafter described, and inthe combination of a guardplate with the fire-pot.

A is the fire-pot, of cast-iron, having a grate, B, and made with its upper part flaring at C, forming a rim, a, whose diameter is considerably larger than the diameter of the fire-pot itself. W'ithin the rim a, I place a series of spurs, b, upon which the boiler rests; or, in stead of the spurs b, another and interior annular rim may be formed having openings corresponding to the spaces c between the spurs b, as shown. A series of openings, d, through the fire-pot form ilues, through which the products of combustion pass to the outside ofthe fire-pot. IVithin the tire-pot is a shell or lining, D, inolosing an air-space between it ,and the wall of the fire-pot, through which air is admitted, by means of small openings e at the bottom and c at the top, to the interior ofthe fire-pot, thereby aiding in the more perfect combustion by the admission of fresh air to the section of the lire-pot occupied by the gases liberated from the coal, and also protecting the outer wall of the fire-pot from the action of the fire.

The boiler consists ofthe shell E and a plate, F, forming the crown-sheetjoined at its edge to the flanged rimf of the shell E, preferably by bolts f, passing through au annular ring,

5o f2, by which the edge of the crown-sheet is securely clamped between the ring f 2 and the tlangef; or the annular ring j'2 may be omitted and the heads of the bolts may be squared and brought directly against the under side of the crown-sheet. A ring, g, is attached concentrically to theinterior surface of the crownsheet F, the surface in contact with the crownsheet being limited to that immediately surrounding the attaching-bolts, so as to secure a Water-tight joint. A tripod, h, is attached to the ring g, and a screw-thleaded bolt, ,whose head rests against the outer surface of the shell E, is screwed into the tripod to resist the strain resulting from the steam-pressure. The diameter of the crown-sheet is slightly smaller than that of the rim a, which is higher than the tops of the spurs b, so the boiler will be retained in position with the annular ringf" resting on the spurs b.

The base-plate G, forming the top of the ashbox H, supports a sheet-metal case, I, surrounding the fire-pot and boiler, and having a smoke-pipe, J.

A castmetal guard plate, K, is placed around the fire-pot opposite the flue-openings d, having an air-space between it and the case I, to prevent the current of heated air from impinging against the sheet-metal case. Equidistant prongs or spurs L extend outwardly from the rim of the fire-pot to sustain the guardplate, and are bent downward to carry the lower edge of the guard-plate below the flue-openings el, the ribs)l serving to brace the prongs L, and also stiifen the flaring shell of the tire-pot.

Upon the guard plate I usually place a sheet-metal conical shell, M, forming a lining to the outer case, I.

Pipes m m allow steam to be taken from and the water of condensation to be returned t0 the boiler in the ordinary manner.

It has been customary in steam-generators of this class to fasten both the crownsheet and shell to the fire-pot, requiring a water-tight joint to be made and maintained between those portions forming the boiler proper and the fire-pot,which has been difficult, owing to the unequal expansion of the walls of the lire-pot, which are subjected directly to the intense action of the fire and the shell of the boiler, which is brought in contact with the water and its temperature restricted within 212 Fahrenheit.

In the construction herein shown the only IOO watertight joint required to be maintained is between the shell E and crown-sheet F, both of which are in contact with the inclosed body of water N. The stay-rod t' may be applied and the amount of tension regulated after the boiler has been constructed, the douieE itself acting as a brace.

I do not confine myself to the special form I of dome shown; neither do I claim, broadly,

the fire-pot having spurs upon which the boiler rests; but

Vhat I do claim as my invention, and desire to secure by Letters Patent, is-

1. A- steam-generator consisting of a re-v pot and a shell or dome having a ange around its lower edge, and a plate or crown-sheet attached at its edges to said flanged edge of the shell or dome, forming a water-tight boiler, said boiler resting upon said tire-pot, but disconnected therefrom, as described, and for the purpose set forth.

2. The steamgenerator consisting of a repot and a watertight boiler resting on but disconnected from said fire-pot, said boiler consisting of a shell or dome, its lower edge forming a flange, an annular ring correspond ing with said iiange, and a plate orl crown-4 sheet having its edge clamped between said fiange and annular ring, which are firmly drawn together, as described, and for the pur 3o pose set forth. v

3. In a steam-generator, the combination, with a lire-pot having its top flaring and hav- Y ing a series of spurs supporting the boiler, and a rim inclosing the edge of the boiler, said rim 55 having a vseries of flue-openings, of a boiler` consisting of a shell and crown-sheet, as described, and for the purpose set forth.

4. The combinatiou,with a steam-generator vconsisting of a flaring tire-pot and a boiler 4o- 'and for the purpose set forth.

LUCIUS W. PON D.V

Tituessesz N. C. STEERE, RUFUs B. FoWLER. 

